Automatic grading of sawlogs: A comparison between X-ray scanning, optical three-dimensional scanning and combinations of both methods

Authors: Johan Oja; Stig Grundberg; Johan Fredriksson; Per Berg

Source: Scandinavian Journal of Forest Research, Volume 19, Number 1, February 2004 , pp. 89-95(7)

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Abstract:

As sawmills become increasingly efficient, the importance of focusing on value recovery becomes obvious. To maximize value recovery, sawmills require the ability to sort logs according to quality. This study compares four different combinations of three-dimensional (3D) and X-ray scanning that can be used to grade logs automatically. The study was based on 135 Scots pine ( Pinus sylvestris L.) logs that had been scanned with both a 3D scanner and an X-ray scanner with two X-ray sources. The percentage of boards with correct grade sawn from automatically graded logs varied from 57% when using only 3D scanning to 66% when using a combination of 3D scanning and X-ray scanning in two directions. The highest possible result, with ideal log grading, was 81%. The result also shows that the combination of a 3D scanner and one X-ray direction results in higher accuracy than a scanner based on two X-ray directions.

Keywords: 3D scanning; automatic grading; Pinus sylvestris; PLS; sawlogs; sorting; X-ray

Document Type: Research article

DOI: http://dx.doi.org/10.1080/02827580310019563

Affiliations: 1: Swedish Institute for Wood Technology Research Skeria 2 SE-931 77 Skellefteå Sweden

Publication date: 2004-02-01

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